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  <title>function和json</title>
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<body>

  <span id="spTime">显示当前时间</span>

  <hr>

  <span id="spClassId"></span>
  <span id="spClassname"></span>
  <hr>
  <span id="spClass"></span>
  <hr>
  <span id="spStudent"></span>

  <br>
  <br>
  <br>

  <button> Button</button>



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